For this sprawling retail center in the Irish Hills section of San Luis Obispo on Froom Ranch Road, T&S Structural engineered over 75,000 sq. ft. of new structures and an 18- foot pedestrian footbridge. Located on Los Osos Valley Road in front of existing retail buildings for Costco and Home Depot, Irish Hills Retail Center consists of big-box retailers such as Office Depot and smaller commercial buildings such as Starbucks.